NASA Study: Moon Is Made of Material From Earth, Not Theia

February 10, 2019

Some 4.5 billion years ago, a Mars-sized rock is theorized to have collided with the proto-Earth. The collision is one of the only ways to create an Earth-Moon system with the properties we observe today. It also may have partially re-liquefied Earth’s surface, destroyed Chaotian property values, and created an atmosphere of plasma metal vapor around both our planet and the enormous cloud of angry debris that now surrounded it.